US1178753A - Direct-service one-point-control dume-waiter. - Google Patents

Description

- H. 61 B. RUWNTRYEE. DIRECT SERVICE ONE POINT CONTROL DUMB WAITER.

APPLICATION FILED APR.8,1914- 1, 178,753. Patented Apr. 11, 1916.

2 SHEETSSHEET l- QwwwmM/a: I Q

'IXll'. COLUMBIA PLANOGRAPH 20., WASHINGTON, n.

H. & B. ROWNTREE.

DIRECT SERVICE ONE PO INT CONTROL DUMB WAITER.

APPLICATION FILED APR. 8, I914- Patented Apr 2 SHEETS- SHEET 2.

UNITED STATES PATENT curios,

HAROLD ROWNTREE, OF KENILWORTH, ILLINOIS, AND BERNARD ROWNTREE, OF ORADEL, NEW JERSEY, ASSIGNORS TO BURDETTE-BOWNTREE MANUFACTURING COMPANY, A CORPORATION ILLINOIS.

DIRECT-SERVICE ONE-POINT-GONTROL DUMB-WAITER.

Application filed. April 8, 191

To all whom it may concern:

Be it known that we, HAROLD RowNTRnE and En mane ROWNTREE, both citizens of the United States, and residing, respectively, at Kenilworth, county of Cook, State of Illinois, and Oradel, county of Bergen, State of New Jersey, have made a certain new and useful Invention in Direct-Service One- Point-Control Dumb-WVaiters, of which the following is a specification.

This invention relates to dumbwaiters, and particularly to dumbwaiters of the one point control type.

The object of the invention is to provide a direct service control for dumbwaiters vof the one point control type.

A further object of the invention is to provide means whereby the dumb waiter, when started on its travel to any predetermined floor or landing must return to the starting point or control floor before it can be sent to any other floor or landing.

A further object of the invention is to provide a construction and arrangement of control for dinnb-waiters whereby the operation thereof is controlled from one point or floor only, to cause the car to proceed to any desired floor or landing, and to one floor or landing only,'after being started up, and to return to the starting floor or control point before it can be sent to or arrested at any other floor or landing. I a

A further object of the invention is to provide a direct service one point control system of the nature referred to wherein signals may be made from any floor or landing to the starting floor or control point, but without accomplishing any control of the car from the signaling points.

A further object is to provide means in a one point control system of the class referred to whereby a signal is made whenever the hatchway door is open at any landing, but will not be made while the car is in motion or is at the starting or control floor.

A further object is to provide means in a control system of the nature referred to whereby the closing of the hatchway door at any landing to which the car has been sent from the control floor, will cause the car to return to the control floor.

A further object is to provide means in a Specification of Letters Patent.

Serial No. 830,405.

control system of the nature referred to whereby the car cannot be moved while any one of the hatchway doors is open.

A further object is to provide means in a control system of the nature referred to whereby a hatchway door can be opened only when the car is at rest opposite said door.

A further object is to provide means in a control system of the nature referred to whereby the hatchway door is automatically opened only when the car is brought to rest opposite it.

A further object is to provide means in a control system of the nature referred to whereby the car can be arrested and returned to the starting floor at any time by the starter or attendant at the starting point after it has been started on its trip.

A further object is to provide a direct service one point control for dumbwaiters which is simple in construction and arrange ment and eflicient in operation.

Other objects of the invention will appear more fully hereinafter.

The invention consists substantially in the construction, combination, location and relative arrangement, all as will be more fully hereinafter set forth, as shown in the accompanying drawings, and finally pointed out in the appended claims.

Referring to the accompanying drawings: Figure l is a VlQW in diagram illustrating a direct service one point control dumbwaiter system embodying the principles of our invention. Fig, 2 is a broken view in elevation showing a dumbwaiter hatchway and car, and control devices associated with the ear and employed in accomplishing the objects of our invention.

The same part is designated by the same reference sign wherever it occurs throughout the several views.

In the operation of automatic dumbwaiters of the one point control type, the car is under the control and direction of an attendant or operator stationed at the con trol point or floor or other despatching point, and the car can be started or its operations controlled only from this single station or one point control. In many instances it is desirable that while the car remains under the control and direction of the attendant at the despatching statlon or one point control, it can be sent to any de-' sired floor at any time but it must return to the starting point after serving a floor before it can be sent to any other floor. This is called the direct service control of one point control dumb waiters, and it is to the provision of means to secure direct service operation of one point control automatic dumb waiters that our present invention more particularly relates.

In Fig. 2 we have indicated an automatic dumbwaiter construction and arrangement embodying our invention wherein 13 is the car, which operates in a hatchway A, having doors B, at the landing floors where the car is to stop. The car hoisting motor is indicated at C, and may be of the usual or any desired or preferred type or construc tion. \Ve prefer to employ counter-weighted hatch doors which are normally locked in closed position and against the action of the counterweight so that when the lock of a door is released, the door will automatically open. We have indicated at D, a shoe which is carried by the car and which is projected outwardly by a solenoid 15, when the latter is energized, thereby releasing the lock of the door opposite which the car may be standing at the time said shoe is projected. The car is provided with a signal device 14:, shown, for illustration, as a bell. The door, when closed, maintains a switch 23, 22, 21, closed, but when any door is open its associated switch is open. The hatchway is provided with limit stops, 16, 17, 18. The car controller is indicated at 19, and associated therewith or in convenient relation thereto is an annunciator 27, while a push button 24, 25, 26 is located at each floor or landing at which the car is to stop. A control push button 28 is also located, together with the control box 19, and annunciator 27, at the control point from which the car operations are controlled.

In Fig. 1 we have shown in diagrammatic form the wiring connections for the direct service one point control automatic dumbwaiter system of our invention and wherein 1, designates the wall switch, and 2, 3 and small auxiliary switches, of which 2 and 3, have each a single magnet for operating them while switch -l employs two magnets. Numerals 5 and 6, respectively designate the magnets or solenoids which operate the main switches for controlling the up and down travel of the car hoisting motor. A series of magnets, indicated at 7, 8, 9, 10, corresponding in number to the different iioors at which the car is to stop are employed. In this instance we have shown four of such magnets, and their function is to cooperate with the automatic motor operated control mechanism in arresting the car when it reaches a predetermined landing at which the car is to stop. Selector switches for controlling the intermediate stops are indicated at 11 and 12. It will be understood that the limit switch 16 is located at the upper end of the hatchway and is autoinatically opened when the car 13 reaches the upper limit of its travel, and similarly, the limit switches 17, 18 are located at the lower end of the hatchway and are also designed to be'opened automatically by the car when it reaches the lower limit of its travel. The push buttons 21, 25, 26, which, as above explained, are respectively arranged at the floors above the first, starting or despatching floor, are respectively arranged to operate the pointers of the annunciator 27, which pointers are suitably designated to correspond respectively with the different floors. The annunciator is preferably placed adjacent the controlling box 19. Of course it is to be understood that there will be as many push buttons, 2 1, 25, 26 as there are floors to be served by the car, and a corresponding number of pointers in the annunciator box. In accordance with our invention we provide an auxiliary switch, which may be of any desired character, indicated at 28, and so arranged and connected that whenever said switch 28 is open, the car will be arrested, as will be explained later and will also be caused to immediately and automatically return to the control station or from the starting or despatching point. A battery 29 or other suitable source of current may be provided for the circuit of the signal device let on the car and for the circuits of the annunciator 27.

We will now describe the operation and electrical connection concerned therewith.

Let it supposed that the car is at the first or main floor and that it is desired to despatch it from that floor, which may be regarded as the controlling point or despatching floor, to the third floor. It will be supposed also that all the hatchway doors B, have been closed and that the car is ready to start on its travel. The controlling operator will move the handle 80 on the control base 19 until it points to the figure 3 on the dial-plate of said base which corresponds with the third floor, it being understood that said dial carries as many floor designations as there are floors at which the car is to stop. The operator then depresses push button 37 at the pivotal axes of the handle 80. This will complete circuit connection between the strip 36 and the contact piece 39 under the floor designation 3. This will complete a circuit as follows: From switch 1 to binding post 30, to the armature 31 of switch 1, to contact 33, to contact at, to armature of switch 3,

to contact strip 36 of the control base, to contact 39, to the floor magnet 9. It is noted here, that the floor magnets 7, 8, 9, 10 have one end of the winding of each magnet attached to the core of said magnet while the other end of the magnet windings are all connected to acommon return conductor. Upon reaching the floor, magnet 9, the circuit above described continues through the coil of said magnet to the common return conductor 51, then to the binding post 52, through auxiliary switch 28, thence successively through all of the door switches 20, 21, 22, 23 in series and then to the return binding post 53 of switch 1. This circuit being completed causes magnet 9 to become energized thereby drawing up the armature 50 of said magnet against the core of said magnet and this action then completes the following branch circuit: from switch 1 and binding post 30 to armature 31 of switch 4, magnet 32, then to and through the coils of the large solenoid 5, which controls the up switches of the motor, thence to the upper limit stop 16, to the binding post 43 of magnet 10, thence to the points 44, 45 of the selectors 12, 11. Under the conditions as sumed, the car is at the bottom floor and consequently, the selectors 11, 12 will be in contact respectively with contact points 45, 44 and therefore the circuit from 44 will continue through the selector switch 12 to the armature 50 of magnet 9 through the core of said magnet, then through the windings of said magnet to the common return 51 and on through the switch 28 and the door switches 20, 21, 22, 23 to the return binding post 53 of switch 1. The closing of this circuit will energize magnet 32 of switch 4 and also the large solenoid 5 and will also continue to energize magnet 9 even when the first circuit above traced is opened. The energization of the large solenoid 5 will cause the motor circuits to be closed and the switch 54 to be opened. The closing of the motor circuit for the up movement of the car through the actuation of the switch controlled by solenoid 5 starts the motor and hence also the upward travel of the car on its journey toward the predetermined floor, in this instance the third floor, at which the car is to stop. The energization of small magnet 32 causes armature 31 of switch 4 to be attracted, thereby moving said armature 31 out of connection with contact 33 and into connection with contact 56, thereby breaking the circuit first above traced through the control base 19 and floor mag net 9, but, as before explained, the second circuit which was completed through magnet 9 and the selector switch 12 remains completed and therefore magnet 9 continues to be energized. When the armature 31 of switch 4 comes into connection with contact 56, the following circuit is completed: From switch 1, binding post 30, to armature 31, contact 56, small magnet 57 which also acts upon armature 31 of switch 4, then to com mon return 51 and through auxiliary switch 28 and the floor switches 20, 21, 22, 23 to return at 53 of switch 1. The completion of this circuit causes magnet 57 to become energized so that during the time the car is in motion the armature 31 of switch 4 is held against contact 56 by the action of both magnets 32, 57. Referring to switch 3, it is to be noted that the magnet 58 has its wiring connections made to the opposite sides of the motor armature and therefore whenever said armature is in motion this magnet will be energized by the differences in electric pressure on opposite sides of the armature, and the magnet armature 35 will consequently be moved from connection with contact 34, thereby breaking the circuit of the conductor strip 36 of the control base.

19. At this time the hoisting motor is in operation and the car is traveling from the first or controlling floor toward the third floor with the main motor switch closed by solenoid 5, with the floor contact controlled by magnet 9 closed, with the circuit open between contacts 54 of the main motor up switch, with the switch 4 armature 31 closed on to contact 56 and open from contact 33, and with switch 3 open from contact 34. This means that all connections of current to the control base 19 are broken.

When the car reaches the third floor a moving part which is operated coincidently with the travel of the car engages selector 12 and moves it out of connection with contact 44, thereby breaking the circuit which includes the switch controlling solenoid 5, the small magnet 32 and the magnet 9. The switch controlled by solenoid 5 will there fore be open, thereby breaking the motor circuits and stopping the car and closing contacts 54 upon each other. The floor magnet 9 becomes deenergized, thereby opening the connections which it controls.

The small magnet 32 becomes deenergized but this does not open switch 4 for the reason that said switch or the armature 31 thereof continues to be held in electrical connection with contact 56 through the action of magnet 57,the circuit of which re mains closed. Thereupon the following circuit is completed; from switch 1 and binding post 30, armature 31 of switch 4, contact 56, contacts 55 to contact 54 to solenoid 15 on the car to binding post 52, auxiliary contact 28, door switches 20, 21, 22, 23 to return binding post 53 of switch 1. The completion of this circuit energizes solenoid 15, thereby causing a projection of the shoe 1) (Fig. 2) which controls the lock of the door B at the landing at the third floor, thereby releasing said lock and since the door is over counter-weighted as above explained, the door immediately opens, thereby opening the door switch 22, for instance, at the third floor. The opening of this switch also opens the circuit of small magnet 57 as the return of this magnet also passes through the door switches. The switch 1 therefore becomes opened again and the armature 31 thereof brought into connection with contact 33. When armature 31 leaves contact 56, the circuit of solenoid 15 on the car is thereby opened. Thus it will be seen that the solenoid 15 is only energized momentarilyfor the interval between the time the car has stopped and the hatchway door B opposite it has moved sufliciently to open its associated switch.

The moment the armature 31 of switch 1 again comes into connection wit-h contact 33, the following circuit is completed: From switch 1 and binding post 30 to armature 31, contact 33, contact 3-1 of switch 3, armature 35, contact strip 36 of the control box, wire 42, limit stop switch 18, contact 11 on the control base which corresponds with the first floor stop, thence to magnet 59 of switch 2 and to return post 53 of switch 1. This energizes magnet 59 of switch 2 and causes the armature 81 thereof to move into connection with contact 60. This completes a. circuit from battery 29 to contact 60, to armature 81, through the signal device let on the car, back to the battery 29, thereby causing the signal to be operated the moment the door has opened sufiiciently to break the door switch circuit. The signal device continues to operate, or if said signal device is in the form of a bell, the bell continues to ring until the associated hatch door is again closed. Thus it will be seen that the car has traveled from the despatching floor or control point to the third floor, has come to rest opposite the third floor, the hatchway door opposite the car at the third floor landing has automatically opened and the signal device has commenced to operate, thereby attracting the attention of the attendant on the third floor. will then perform the duties required by the presence of the car at the third floor landing, by unloading the contents from the car or loading material on to the car, as the case may be and then will close the door. lVhen the door closes completely the latch will operate to lock it in its closed position, said latch not being held retracted as by the solenoid 15 as said solenoid is no longer energized, the circuit thereof being broken by reason of the fact that at this time the armature 31 of magnet 4: is no longer in connection with contact 56. The moment the door is completely closed its associated switch 22, for instance, again closes and thereupon the following circuit is completed; from switch 1 and binding post 30 The attendant to armature 31 of switch 4, contact 33, contact 34, armature 35, contact strip 36 of the control base 19, wire 41-2, limit switch 18, contact e11, floor magnet T to common return 51, auxiliary switch 28, door switches 20, 21, 22, 23 to return binder post 53 of switch 1. This energizes magnet 7 and draws its armature 16 against the core of said magnet, thereby completing the following circuit: From switch 1 and binding post 30 to armature 31 of switch 4:, magnet 32 the down motor switch controls solenoid 6, the lower limit stop 17, the armature 16 of magnet T, the core of said magnet, through the coils of said magnet, common return 51, auxiliary switch 28, door switches 20. 21, 22, 23 to return binding post of switch 1. This closes the motor circuits to operate the motor in a direction to cause the down travel of the car. The car thereupon starts upon its return travel. When it reaches the first floor it will be arrested by the opening of switch 17, which is opened by the car reaching its lower limit of travel, thereby breaking the circuit passing through the floor magnet 7 and the solenoid 6, as well as that of magnet 32 of switch 1. The succeeding action will be the same as that above described when the car stopped at the third floor with this differ ence: hen the attendant opens the hatchway door at the controlling station or first floor, the signal device 11 will not operate because at this time the limit switch 18 will be opened thereby opening the circuit of magnet 59 and consequently the armature 81 of said magnet is not in connection with contact 60 which is included in series in the circuit of the signal device. Another difference is that when the hatchway door at the controlling point or first floor has been closed again the small magnet 7 will not be energized since the limit stop 18 which is included in series with the windings of said magnet will be open.

We will now explain the action and purpose of the auxiliary switch 28.

It sometimes happens after a car has been started on its journey from the first or despatchingfloor toward any other pre-determin'ed floor that the operator finds he has mace a mis'alre and has started the car toward the wrong floor, that is, he has erroneously set the control handle 80 of the control base to the wrong floor designation on the base dial. In such event the car may be arrested in its travel and caused to return to the despatching floor, simply by opening momentarily the auxiliary switch 28 and then closing the same, that is, in case the switch 28 is in the form of a push button, by simply depressing the button for an instant and then releasing it. It will be seen that the auxiliary switch 28 is always included in the circuit of the floor control magnets 7,8, 9, 10 and also of the switch controlling the solenoids 5, (3, whenever any one of said floor magnets or either of said solenoids is in operation. The moment the auxiliary switch 28 is closed again, it operates exactly the same as when a door has been opened and closed again as above ex- I plained. There is this diii'erence, however, between the car being automatically arrested at any floor or being arrested by means of the auxiliary switch 28. When the car is arrested automatically, at a landing or floor, the solenoid 15 which controls the hatohway door lock is energized, as above explained, and is deenergized again as soon as the hatohway door starts to open. On the other hand, when the car is arrested by the operation of the auxiliary switch 28, being opened, the circuit of solenoid 15, which also includes said switch 28 is also opened and consequently the solenoid 15 will not be energized even in case the arrest of the car by opening the switch 28 should happen at the instant when the car is opposite a hatohway door and there fore said hatohway door will not be opened and when the switch 28 is again closed, the car will automatically return to the despatching floor.

From the foregoing description it will be seen that we provide an exceedingly simple and efficient automatic elevator system of the direct service one point control type wherein an attendant at the control station by simply moving the control base pointer into position to predetermine a floor or landing for the car and then close an electric circuit, the car hoisting motor is put into operation to cause the car to proceed to the predetermined floor or landing. When the car arrives at the predetermined floor or landing, it is automatically arrested and the hatohway door at said landing or floor is automatically unlocked and automatically opens, and a signal device is automatically put into operation. After the completion of the purpose for which the car is despatched to the predetermined landing, the mere act of closing the hatohway door at that landing automatically causes the hoisting mechanism to start up in a direction to return the car to the despatching floor or control point, the car coming to rest at the despatching floor but without causing the signal device to be operated at the starting floor when the hatohway door at that floor is open nor will the mere closing of the hatohway door at the starting floor set the hoisting mechanism in operation. It will also be seen that the attendant at the control station may be notified through the push button signals and annunciator from any floor that the car is desired at that floor but the attendant at any other floor, except the starting floor, has no other control over the car movements except to notify the starting attendant that the car is desired, and the return of the car to the starting floor by the floor attendant merely closing the door. It will also be seen that at any time the starting attendant may arrest the travel of the car after it has been despatched from the starting floor or station and cause it to return automatically to the starting station.

It should be explained that the switch 3 plays an important part in its cooperative relation with reference to the function and operation of the auxiliary switch 28. When the car is stopped by opening the switch 28 and when the switch is closed again, it would immediately complete the reverse circuit of the motor. In order to prevent the reverse circuit of the motor being completed until the motor armature has stopped revolving in the opposite direction, the switch 3, or its control magnet 58 is interposed in the armature circuit and therefore even if the switch 28 is instantly closed after having been opened, the reverse motion of the hoisting motor will not commence until the armature has ceased to revolve in the other direction.

While we have described a construction in which when the car reaches a predetermined landing the door opposite the car automatically opens upon release of the door lock. It is obvious that the automatic opening of the door is not an essential of our invention, since the door lock may be released without the door automatically opening, in which case the door maybe opened by hand by an attendant, on the floor at which the car stops. In this case the opening of the door by hand will accomplish the same purposes and result in the same operations as where the door opens automatically.

Having now set forth the object and nature of our invention, and a construction and arrangement embodying the principles thereof, what we claim as new and useful and of our own invention and desire to secure by Letters Patent is:

1. In an automatic elevator system, a hoisting mechanism, means located at a controlling station for controlling said hoisting mechanism, said means operating to start the car and to arrest it automatically at any predetermined landing and automatic means at the predetermined landing for operating the hoisting mechanism controlling means to cause the car to return to the controlling station when the landing door is closed.

2. In an automatic elevator system, a hoisting mechanism, means located at a controlling station for controlling said hoisting mechanism, said means operating to start the car and to arrest it automatically at any predetermined landing, and a signal device on the car operable only when the car is at the predetermined landing.

3. In an automatic elevator system, a hoisting mechanism, means located at a controlling station for controlling said hoisting mechanism, said means operating to start the car and to arrest it automatically at any predetermined landing, a hatchway door, a Signal device on the car, and means controlled by said door for rendering the signal inoperative and the hoisting mechanism control means operative when the door is closed.

I. In an automatic elevator system, a hoisting mechanism, means for controlling the same, said means operating to start the car and to arrest it automatically at a predetermined landing, a hat-chway door at the landing at which the car is arrested, a lock therefor, means controlled from the car when it reaches the predetermined landing for releasing said lock, and means controlled by the closing of said door for caus ing the car to return to its starting point.

5. In an automatic elevator system, a hoisting mechanism, means for controlling the same, iid means operating to start the car and to arrest it automatically at any predetermined landing, a hatchway door at the landing at whichthe car is arrested, means controlled by the opening of said door for rendering the motor controlling means inoperative and means controlled by the closing of the door for causing the car to return to the starting point.

6. In an automatic elevator system, a hoisting motor, means located at a controlling station for controlling the same, said means operating to start the car and to arrest it automatically at any predetermined landing, a hatchway door at the landing at which the car is arrested, means controlled by the opening of said door for rendering the motor controlling means at the controlling station inoperative, and means controlled by the closing of the door for causing the car to return to the starting point.

7. In an automatic elevator system, a hoisting motor, means for controlling the same, said means operating to start the car and to arrest it automatically at anyipredetermined landing, a hatchway door, a signal device on the car, and means controlled by the door for rendering the signal operative and the motor control inoperative when the door is opened.

8. In an automatic elevator system, a hoisting motor, a control mechanism therefor, said mechanism operating to start the car and to arrest it automatically at any predetermined landing, a hatchway door, a signal device, and means controlled by the door for rendering the signal device operative, and the motor control mechanism inoperative when the door is opened.

9. In an automatic elevator system, a hoisting motor, a control mechanism therefor, said mechanism operating to start the car and to arrest it automatically at any predetermined landing, a hatchway door, a

signal device, and means controlled by the door for rendering the signal device inoperative and the motor control mechanism operative when the door is closed.

10. In an automatic elevator system, a hoisting motor, a control mechanism therefor located at a controlling station and operating to start the car and to arrest it automatically at any predetermined fioor, a hatchway door, a. signal device on the car, and means controlled by said door for rendering the signal operative and the hoisting motor control means inoperative when the door is open.

11. In an automatic elevator system, a hoisting motor, controlling means therefor located at a control station, said means op erating to start the car and to arrest it antomatically at any predetermined landing, and means at the control station for causing the return of the car to the starting floor after said motor control means have inaugurated a despatch of the car from said floor.

12. In an automatic elevator system, a hoisting motor, controlling, means therefor located at a control stat-ion, said means operating to start the car and to arrest it antomatically at any predetermined landing, and auxiliary control means also located at the control station for arresting the car while in action as the result of being despatched from the starting floor, and causing the cart to return to the starting floor.

13. In an automatic elevator system, a hoisting mechanism, means for controlling the same, said means operating to start the car and to arrest it automatically at any predetermined landing, a hatchway door at the landing at which the car is arrested, means controlled from the car when it reaches the predetermined landing for causing the door to open automatically, and means controlled by the closing of the door for returning the car to its starting point.

i i. In an automatic elevator system, a hoisting mechanism, means for controlling the same, said means operating to start the car and to arrest it automatically at any predetermined landing, a hatchway door at the landing at which the car is arrested and operative when the car reaches the predetermined landing for opening said door, and means made operative by closing the door for returning the car to its starting point.

15. In an automatic elevator system, a

ll i

hoisting mechanism, means for controlling 13c the same, said means operating to start the car and to arrest it automatically at any predetermined landing, and means controlled by the closing of the door at the said landing for operating the hoisting mechanism to cause the car to return to the starting floor.

16. In an automatic elevator system, a hoisting mechanism, means for controlling the same, said means operating to start the car and to arrest it automatically at any predetermined stopping point, a door at each floor at which the car is to stop, a switch operated by each door, a signal. device arranged on the car, means for controlling the signal device and means controlled by the door switches for controlling the signal controlling means.

17. in an automatic elevator system, a hoisting mechanism, means for controlling the ae, said means operating to start the car and to arrest it automatically at any predetermined stopping point, a door at each floor at which the car is to stop, a switch o erated by each door, a signal de vice arranged on the car, a circuit therefor, means for controlling said circuit, and means controlled by the door switch for controlling said circuit controlling means to close the signal circuit when a door is opened.

18. In an automatic elevator system, a hoisting motor, means for controlling the same, said means operating to start the car and to arrest it automatically at any predetermined landing or floor, a hatchway door at each landing or floor, a locking device for each door, a signal device on the car, means automatically operated when the car arrives at the predetermined landing or iioor for releasinggthe lock of the door at that landing or floor, and means controlled by the opening of said door for rendering operative said signal device.

19. In an automatic elevator system, a hoisting motor, means located at a control station for controlling said motor, said means operating to start the car and to arrest it automatically at any predetermined floor, a. hatchway door at each floor, a lockiug device for each door, a signal device on the car, meansautomatically operated when the car arrives at the predetermined floor for releasing the lock of the door at that floor, and means controlled by the opening of said door for rendering operative said signal device.

20. In an automatic electric elevator, a hoisting mechanism, means for controlling the same, said means including an electric circuit operating to start the car and to arrest it automatically at any predetermined stopping point, a signal corresponding to each floor or landing at which the car is to stop associated with said circuit, and an circuit operating to start the car and to arrest it automatically at any predetermined stopping point, a signal corresponding to each floor or landing at which the car is to stop, associated with said circuit, and arranged to indicate to the hoisting inechanism attendant in advance of the starting of the car the floor at which the car is to stop, means for operating said signal device from the various floors or landings, and a signal device on the car, made operative while the car is at a predetermined stopping point to which it has been sent.

22. In an automatic electric elevator, a hoisting mechanism, means for controlling the same, said means including an electric circuit operating to start the car and to arrest it automatically at any predetermined stopping point, a signal corresponding to each floor or landing at which the car is to stop, associated with said circuit and arranged to indicate to the hoisting mechanism attendant in advance of the starting of the car the floor at which the car is to stop, means for operating said signal device from the various floors or landings, a hatchway door at each floor or landing, a. signal on the car, and means controlled by the opening of the doors at the landing opposite which the car has stopped, for male ing operative the car signal.

23. In an automatic electric elevator, a hoisting motor, means for controlling the same, said means operating to start the motor and to arrest the same when the car arrives at any predetermined landing, a hatchway door located at each landing, a loclr therefor, means for releasing said loch, electric devices for operating said releasing means, a circuit for said electric devices, and a magnet connected across the terminals of the motor armature for controlling said circuit.

24. In an automatic electric elevator, a hoisting motor, a car, a hatchway door, a loclr for the latter, electric devices for releasing the lock, means for controlling said motor including a main switch, said switch when opened operating to close the circuit of the lock releasing electric devices.

25. In an automatic elevator, a car arranged to operate between landings, a hoisting mechanism, control devices therefor,

means at one landing for operating said devices to cause the car to start from said landing and to stop automatically at the other landing, a door at the last mentioned landing, and means controlled by the closing of said door for causing the car to return to the starting landing.

26. In an automatic elevator, a car arranged to operate from a starting landing to any one of a plurality of other landings, means to start the car from the starting landing and to arrest it at any predetermined one of the other landings, a door at the predetermined landing, and means controlled by the closing of said door for causing the car to return to the starting landing.

27. In an automatic elevator, a car arranged to operate from a starting landing to another landing, means to start the car from the starting landing and to arrest it at said other landing, a signal device on the car, a door at said other landing, means controlled by the opening of said door for actuating said signal device, and means controlled by the closing of said door for causing the car to return to the starting landing.

28. In an automatic elevator, a car arranged to operate from a starting landing to another landing, means to start the car from the starting landing and to arrest it at said other landing, a signal device on the car operable only when the car is arrested, a door at said other landing and means con trolled by the closing of said door for caus ing the car to return to the starting landing.

29. In an automatic elevator, a car arranged to operate from a starting landing to another landing, means to start the car from the starting landing and to arrest it at said other landing, a door at said other landing and a signal device on the car, said signal device being operable only When the car is arrested and said door is open.

30. In an automatic elevator, a car arranged to operate from a starting landing to another landing, means to start the car from the starting landing and to arrest it at said other landing, a door at said other landing, a signal device on the car, said signal device being operated only When the car is arrested and said door is open, and meanscontrolled by the closing of the door to render the signal inoperative and to return the car to the starting landing.

31. In an automatic elevator, a car arranged to operate from a starting landing to another landing, means to start the car from the starting landing and arrest it at said other landing, a door at said other landing, and means to automatically return the car to the starting landing, said means being inoperative when said door is open.

32. In an automatic elevator, a car arranged to operate from a starting landing to another landing, means to start the car from the starting landing on its travel toward the other landing, and means controlled from the starting landing for causing the car to return to the starting landing, said means being controllable while the car is in motion.

In testimony whereof We have hereunto set our hands in the presence of the subscribing Witnesses, on this 6th day of April,

HAROLD ROWNTREE. BERNARD ROWNTREE. Vitnesses D. M. Snnovnn, LAURA E. SMITH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of latent; Washington, I). G.

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